Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c5954eb3d083909…

MALICIOUS

PDF

44.1 KB Created: 2021-05-19 05:47:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f5a08f728ec0b6079af1494fdcde36b9 SHA-1: 9edc71db7bea07568f22dede8ee06e7090049dc8 SHA-256: 4c5954eb3d0839096822151d3e82ca8654272754a950972a27af1e52988a74f7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains multiple links to websites that are flagged as malicious redirectors, specifically promoting "game hacks" and "free generators". The document body and heuristics indicate a lure for users to click these links, which likely leads to further malicious content or phishing attempts. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.xyz/app/431946152/how-to-get-free-robux-without-verifying-game-hack In PDF document text
    • https://www.atrax.hr/files/coin-master-game-hack-app_GM406889139.pdfIn PDF document text
    • https://www.atrax.hr/files/hacker-coin-master_GM406889139.pdfIn PDF document text
    • https://www.atrax.hr/files/minecraft-free-version-pc_GM479516143.pdfIn PDF document text
    • https://www.atrax.hr/files/roblox-hack-site_GM431946152.pdfIn PDF document text
    • https://www.atrax.hr/files/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://atrax.hr/files/cheapest-pubg-uc_GM1330123889.pdfIn PDF document text
    • http://atrax.hr/files/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://www.atrax.hr/files/how-to-get-minecraft-windows-10-for-free-with-java_GM479516143.pdfIn PDF document text
    • https://www.atrax.hr/files/mathep_GM431946152.pdfIn PDF document text
    • http://atrax.hr/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.atrax.hr/files/roblox-hacking-website_GM431946152.pdfIn PDF document text
    • https://www.atrax.hr/files/roblox-redeem-card-codes-free_GM431946152.pdfIn PDF document text
    • http://atrax.hr/files/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://atrax.hr/files/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.atrax.hr/files/how-to-get-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://atrax.hr/files/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://atrax.hr/files/coin-master-hack-unlimited-spins-game-download_GM406889139.pdfIn PDF document text
    • http://atrax.hr/files/haktuts-coin-master_GM406889139.pdfIn PDF document text
    • https://www.atrax.hr/files/how-can-i-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.atrax.hr/files/free-roblox-generator_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004bd6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BD6 25500 bytes
SHA-256: a7e87f9d25b82bc3b78b34b6c927a4ee08e9e805c52e59baf14ae2afbdbaf714
font_01_sfnt_off000086d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86D1 19368 bytes
SHA-256: 63de63cfc252acdf530e8b3b2390dbc20d855d9653817057ed506b48c41b68ab

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